Asyn asynDrvUser interface

[Paul Hamadyk <paul.hamadyk@diamond.ac.uk>]

I have a question about the asynDrvUser interface. I usually only define
a drvUserCreate function in order to set pasynUser->reason, and I set
drvUserDestroy to NULL. This worked until I added the asynFloat64
interface.

I've noticed that initAo() in devAsynFloat64.c calls
"pasynFloat64SyncIO->disconnect();" which calls
"pioPvt->pasynDrvUser->destroy()" and that initBo() in
devAsynUInt32Direct.c calls "pasynUInt32DigitalSyncIO->disconnect();"
which calls "pioPvt->pasynDrvUser->destroy()".

If asynDrvUser->destroy hasn't been defined then this clearly causes a
problem so:
1) Should I always be creating a destroy function?

static asynStatus drvUserDestroy(void *drvPvt, asynUser *pasynUser)
{
    return asynSuccess;
}

2) Why do only ao records with an AsynFloat64 interface and bo records
with an AsynUInt32Direct interface call disconnect() in their
initialisation function?

Thanks,

Paul.



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